From: Santosh Shilimkar Date: Fri, 19 Nov 2010 17:31:06 +0000 (+0530) Subject: omap4: l2x0: Enable early BRESP bit X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b89cd71a159b5edca4c429687e4af01708eb1b26;p=linux-beck.git omap4: l2x0: Enable early BRESP bit The AXI protocol specifies that the write response can only be sent back to an AXI master when the last write data has been accepted. This optimization enables the PL310 to send the write response of certain write transactions as soon as the store buffer accepts the write address. This behavior is not compatible with the AXI protocol and is disabled by default. You enable this optimization by setting the Early BRESP Enable bit in the Auxiliary Control Register (bit [30]). Signed-off-by: Santosh Shilimkar Signed-off-by: Mans Rullgard Tested-by: Nishanth Menon Signed-off-by: Tony Lindgren --- diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c index 2006da10f5f5..e7a9b7f13b52 100644 --- a/arch/arm/mach-omap2/omap4-common.c +++ b/arch/arm/mach-omap2/omap4-common.c @@ -82,7 +82,8 @@ static int __init omap_l2_cache_init(void) aux_ctrl |= ((0x3 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT) | (1 << L2X0_AUX_CTRL_SHARE_OVERRIDE_SHIFT) | (1 << L2X0_AUX_CTRL_DATA_PREFETCH_SHIFT) | - (1 << L2X0_AUX_CTRL_INSTR_PREFETCH_SHIFT)); + (1 << L2X0_AUX_CTRL_INSTR_PREFETCH_SHIFT) | + (1 << L2X0_AUX_CTRL_EARLY_BRESP_SHIFT)); } if (omap_rev() != OMAP4430_REV_ES1_0) omap_smc1(0x109, aux_ctrl);